Signaling apparatus for telephonic and telegraphic circuits



i (No Model.)

L. S. FAIRBANKS.

SIGNALING APPARATUS FOR TELEPHONIG AND TELEGRAPHIG CIRCUITS...

No. 292,999 Patented Feb. 5.1884. A

' 6-K OUNJ GNU/Y W/TNESSES. A JfinRB/A MKS,

a l A wins/Wok N. PETERS. PhohrLhhv r-lphar. Washinglou. 0v (2.

Y UNrrEn STATES PATENT @FFICEQ LORENZO S. FAIRBANKS, OF BOSTON, MASSACHU JETTS.

SiGNALlNG APPARATUS FOR TELEPHONIC AND TELEGRAPHIC CIRCUITS.

SPECIFICATION forming part of Letters Patent No. 292,999, dated February 5, 1884.

Application filed June 4, 18?.3.

To aZZ whom it may concern: V

Be it known that I, LORENZO S, FAIRBANKS, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Signaling Appa' ratus for Telephonic and Telegraphic Circuits, i

of which the following is a full, clear, and exact description.

The object of this invention is to obtain signaling or calling mechanism for atelephonic circuit including several stations, by which.

The invention consists in the use at each station of the several stations in the telephonic c1 rcuit of a series of separate armatures, which are adapted to be vibrated in any suitable manner and at different rates of vibrations, but the rates of vibration of those of any one station severally corresponding to the rates of vibration of those of each of the other stations;

and these armatures are arranged in relation to an electro-magnet at each station in the telephonic circuit for either of them to be readily and conveniently placed into operative position as to said electro-magnet, and when so placed to be vibrated in any suitable manner, and to secure at the station in the telephonic circuit having an armature of a cone spending rate of vibration in operative posi: tion relative to its electro-magnet, the vibration of said armature in strict accordance therewith, and thus, with the proper combination and arrangement of a bell or bells or other alarm or signals, cause said alarm or signal to be sounded, all other alarms or signals in the telephonic circuit remaining at rest or undisturbed.

In the accompanying plate of drawings this invention is illustrated, Figure 1 being a plan view, Fig. 2 aside elevation, and Fig. 3 .a plan view illustrating a modification to be hereinafter described; and Fig. 4 is a view in cross-section of Fig. 3.

In the drawings, A represents an electromagnet at one station, and B an electro-magnet at another station, in a telephonic circuit, each having acoil upon only one, a, of its legs. a

G G are a series of armatures at each station,

which armatu res are prefe phonic circuit.

(No model.)

rabl y ofspringsteel, andad apted to be vibrated at their free ends b over the covered leg a of the electro-magnet at such station; andthe armatures at-each station have different rates of vibration, but of corresponding rates of vibration as to the armatures of the several stations in the tele- The stations maybe of any proper number, and in order that at any station of the number any of the other stations and the armature corresponding thereto at the other stations similarly marked-as, for instance, with figures 1 and 2, and thence upward, as shown in the drawings.

As shown in Figs. 1 and 2, the several armatures are radial about a common hub, I), provided with a pintle, E, turning in a socket, (1, of the uncovered leg F of the electromagnet, and of a length that when the arma tures are rotated upon thelegF of the electromagnet any armature can be brought at its outer end, b, into proper position over and above the other leg, a, of the magnet, to be there vibrated in any suitable manner in relation thereto.

1 'As shown in Figs. 3 and 4, the several armatures are arranged to slide laterallyacross and over the leg of the electromagnet, the vibrating armatures being secured by their ends f to a plate, H,having on its under sidea tongue, 9, of dovetail shape in cross-section, which tongue is adapted to fit loosely in a correspondingly-shaped groove, Z, in the upper side of a plate, K, so that the plate H, carrying the armatures,can freely slide in said groove back and forth, and thus any one of the armatures can be brought into position overthe magnet,

to be there vibrated, as described, in lieu of 100 being arranged to be rotated, as shown in Figs. 1 and 2, and just previously described.

G is a bell-alarm adapted to be struck and sounded from the vibration of-an armature at the electro-magnet A, and this bell, if desired, maybe hinged so that it can be put into and out of operative position, when desired, as shown in dotted lines in Fig. 2. The electric connections are made in the usual way, and therefore need no particular description herein, although an electric connection is shown in the drawings. A series of armatures, each armature of which is adapted to be vibrated at a different rate of vibration from the rate of vibration of the other armatures in the series at each station of the several stations of a telephonic circuit, all as has been described, obviously enables any station to be called or signaled from any other station and without notice to any other station of the circuit by bringing the armature belonging to or representing the station to be called or signaled into operative position relative to its magnet, and then vibrating the same,which vibrations cause the armature of the station called to be vibrated, provided, of course, the corresponding armature at the station called or signaled is in operative position relative to its magnet, and thereby gives notice or sounds the hell or alarm at such station.

Although the hell or alarm is described as being sounded from the vibration of the armature directly, obviously it can be sounded without direct contact with the bell by means of suitable electrical connections.

It is necessary for each station in the circuit to have the armature of .its series, which is marked with its number, 820., and represents it always in operative position in relation to its magnet, excepting, of course, when such station desires to call or signal another station, for thereby such station will always be in condition and ready to receive a call or signal from any of the other stations, as is obvious.

The armatures can be vibrated by wind or in any suitable and desirable manner, and can be arranged to vibrate-over both legs of the electro-magnet, if desired.

Having thus described'myinvention, what I claim, and desire to secure by Letters Patent, 1s-

1. In an electric signaling-circuit, and at each station in said circuit, the combination, with an electro-magnet, of a series of vibrating armatures having different rates of vibration, each of 'which armatures is adapted to be brought or moved to and over said magnet, for the purpose specified.

2. In an electric signaling-circuit, and at each station in said circuit, the combination, with an electro-magnet, of aseries of vibrating armatures and an alarm-bell, said armatures having different rates of vibration, and each adapted to be brought or moved to and over said magnet, for the purpose specified.

3. In an electric signaling-circuit, and at each station in said circuit, the combination, with an electro-magnet, of aseries of vibrating armatures having different rates of vibration, and adapted to be severally rotated about a center, for the purpose specified.

4. In an electric signaling-circuit, and at each station in said circuit, the combination, with an electro-magnet, of a series of vibrating armatures and an alarm-bell, said armatures having diiferent rates of vibration, and adapted to be severally rotated about a center, for the purpose specified. v In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

L. S. FAIRBANKS.

\Vitnesses:

EDWIN W. BROWN, WM. S. Burrows. 

